I offer tastings for wedding cake orders only. 3 flavors, 3 fillings, 3 icings $30-$40 (depending on choices) which is due at time of tasting. If they order with me then I deduct $40 from their total order. I require 3 weeks notice for the tasting and will meet in a central location or at their house, whichever they prefer. This ensures that they can taste the cakes and regardless of whether they order or not, I’m at least not out any money for the ingredients, time, etc.